Covid-19: Why are age and obesity risk factors for serious disease?

Worldwide more than 41 million people have now been infected with SARS-CoV-2 and over a million people have died. But what makes this virus so difficult to control, and why are some people more at risk than others? Elisabeth Mahase reports Paul Lehner, professor of immunology and medicine at the University of Cambridge, says that unlike the original SARS coronavirus or influenza, people with…

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